Allow casting a Php::Value to a std::set
Allow casting a Php::Value to a std::set

carlmcdade/PHP-CPP,CopernicaMarketingSoftware/PHP-CPP-LEGACY,CopernicaMarketingSoftware/PHP-CPP-LEGACY,sjinks/PHP-CPP,CopernicaMarketingSoftware/PHP-CPP,sjinks/PHP-CPP,dreamsxin/PHP-CPP,carlmcdade/PHP-CPP,sjinks/PHP-CPP,carlmcdade/PHP-CPP,sjinks/PHP-CPP,carlmcdade/PHP-CPP,CopernicaMarketingSoftware/PHP-CPP,dreamsxin/PHP-CPP